Valve.



F. K. NORTH.

VALVE.

APPLIGATION FILED AUG. 31, 1908.

Patented A401123, 1912.

1N VENTOR.

A TOR; Y.

zu. 2 m z a l2' MWMMMM y E: r... ,JM w .LZ1 v .I 7l. .W&... @if f/ m 7 Qcitizen of the United States, residing at f, clear, and exactdescription of the invention,

' sure and-has for its object to produce a 'l5 disk gate valve.

companying drawing, in Which:-

retiran rime K. nonfrrr; or Beeren, lvriissaeusnrrs.

VALVE.

To all whom 'it may concern Be it known that l, FRED K. NORTH, a

Boston, in the county of Suollr and State otillassachusetts, haveinvented certain new and useful improvements in Valves; and do herebydeclare the following to be a full,

such as will enable others skilled in the art to which it appertains tomake and use the same.

The present invention relates to valves `for conducting liquids orfluids under presgate valve so constructed that the contact-v ing facesof the gate or disk and the seat may be readily regroun'd when worn.

ln the SO-ealled globe valve, which is Well known to those skilled inthis art, the contactiug tacos ot the disk and valve seat can bereground by the application ot a little emery and oilto the gate and itssubsequent-turning while frictionally held in contact with the valveseat, but in the sti-called gate valve, where t-he gate comprises awedge-shaped block iitting in a i wedgeshaped. recess between the portsor seats, it has been `found impossible to regrind the contact surfaces.The gate valve is much preferred because it has man3r advantages overthe globe valve and it is with the oli-- ject ot combining theregrinding features of the globe valve 'with a gate valve that haveproduced the present invention, which may be designated as a regrindingdouble A further object or the invention is to produce a valve and gatewhich is movable to place it in and out of alinenient With its seat orport and also so as to be moved toward the port after it shall have beenbrought into alinernent therewith.

To the above ends the present inventionk disk gate valve which Will-nowbe described and. claimed.

The present invention is shown in the ac- Figure l shows a verticalsectional View through a valve embodying the invention and showing it inits closed position. Fig. 2 shows a similar view with the vvalve stemand gates raised and in in open position.

Fig. o shows in partial end elevation and Letters Patent.

ployed throughout the specification yand drawing to designatecorresponding parts.,

The valve comprises a casting l through. which. is formed a( transversepassage 2, opening intovertical chamber 3, through the ports 4 andSurrounding the ports el anl 5 are lthe inclined' valve seats G and 7made in the forni of separate rings and. secured in place by the matingscrew threads `8 and 9. The. outer edges ot the rings 6 and 7 arebeveled, as shown at l1 and 10, to cooperate with the closing gates 1Qand 13. The gates l2 and 13 are mounted in a head "1% carried by thethreaded end l5 ot the valve stein i@ which passes up through a suitablepacked bearing 17 in a cap 18 held by bolts 19 tothe casting l. Theupper end ot 'toe rod or stein i6 is threaded, as shown at 20, andengages a threaded block 2l arranged to be turned by thewheel 9:2,whereby the stein 16 will be raised `and lowered in a manner Well knownto those skilled in this art.

The gates i2 and 13 are arranged to have a movement up and clown withthe valve stern l@ and also for a purpose to be hereina'fter describedthey are each arranged to permit a relative in'oveinet of. the stem 16and the head le? n th rc, .ion to the gates l2 and 13. To secure thisresult, the gates l2 and i8 upon their inner faces are provided with theinwardly projecting lugs 23 and; the upper lugs supporting removablebolts 25 carrying heads (see Fig. 3 of the drawing), and engaging theinclined p rea-tenten apr. ee, wie; Application filed-[ingest 3 1,3.998.' Serial lo. L565221972 cani slots 27 in the head 14e. llhe lowerlues Q4 carry a removable bar 28 which passes through the inclined slots29 at the lower end ot the Lead le. The above arrangement is such thatas the valve stein 1G is raised the iii "nient oi the head le causes thecani slots .27 x Q9 to draw the valve gates i2 and. i3 toward eachother, thus causing them to assume the posit-ion shown in Q, wherebytheY can be raised into the chamber .fis the valve stem i6 is lowered.,when the lower edges of the gates l2 and 13 engage the lower edges oithe Valve seats 6 and 7, their downward movement will be terminated andthereafter the downward movevertical sectional View the lower part ot anent of 'the vulve stein le' and the head ii rie will, through the camslots and the studs 25 and 28, cause the gates 12 and 13 to be movedoutward to cause them to be rmly seated against the beveled edges 10 and11 of the rings 6 and 7. To assist in the propery contact of the gates12 and 13 with the valve seats, the head 14 will be provided With camrolls 30 arranged to bear upon cam faces 31 on the `inner surface of thegates 12 and 13, and thus'the gates 12 and 13 will be forcibly throwninto contact With the beveled valve seats. The gates 12 and 13 will beprovided with a rabbeted edge 31() in which will be seated a ring 32 ofbrass or other suitable metal arranged to Contact With the rings 6 and 7carrying the valve seats.

To effect the regrinding of the gates or disks in contact with t-hevalve seats they will be disengaged from the head 14 by removing theb'olts 25 and the bars 28, after Which they may be coated with a littleemery and oil and turned while held in contact with the valve seats,which causes a regrinding of the contacting surfaces in the same manneras such operation is performed in the socalled globe valve. v v

It will be noted that an upward movement of the valve stem acts rstthrough the raising of the head 14 to Withdraw in a substantiallyhorizontal line'the gates 12 and 13 from engagement with the valve seatsand having thus been Withdrawn and caused incassa to assume the positionshown in Fig. 2, the valve stem may be elevated, as shown in saidfigure, and that a downward movement of the valve stem causes a forcibleprojection or outward thrust of the gates against the beveled seats 10and 11.

Having described my invention l claim as new and desire to protect` byLetters Patent of the United States A gate valve comprising a verticallymovable stem, a slotted head at the lower end thereof, valve gates atopposite sides of said head, bolts detachably connected to the backs ofsaid gates respectively and passing through inclined slots in the head,said gates having a sliding movement on said head, inclined surfaces inthe rear of said gates, rollers on said head engaging the inclinedsurfaces, valve seats having beveled faces arranged to coperate with thebeveled edges of the respective valve gates, said gates being adaptedtobe disconnected from. the head and turned While in contact with thevalve seats for regrinding, substantially as described.

In testimony whereof I aHiX my signature, in presenceof two WitnessesFRED it. Nonfrn. Vitnesses i T. HART ANDERSON, MARY A. KENNEY.

